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https://issues.apache.org/jira/browse/MAPREDUCE-4358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398341#comment-13398341
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Harsh J commented on MAPREDUCE-4358:
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It may also be related to Jason's earlier report/fix at MAPREDUCE-4228.
                
> Reducers are assigned containers before all maps are assigned containers
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4358
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4358
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.0.0-alpha
>            Reporter: Ahmed Radwan
>
> Reducers start to get containers before all maps are. We have seen this issue 
> and it is problematic since if there is no avaialable resources for the 
> remaining maps, the job will just stall where reducers are waiting for 
> mappers which are unable to start because there is no containers available.

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